import {
  isPlainArray,
  isPlainObject,
  matchMutation,
  parseMutationArgs,
  partialDeepEqual,
  replaceEqualDeep,
  scheduleMicrotask,
  sleep,
} from '../utils'
import { Mutation } from '../mutation'
import { createQueryClient } from './utils'

describe('core/utils', () => {
  describe('isPlainObject', () => {
    it('should return `true` for a plain object', () => {
      expect(isPlainObject({})).toEqual(true)
    })

    it('should return `false` for an array', () => {
      expect(isPlainObject([])).toEqual(false)
    })

    it('should return `false` for null', () => {
      expect(isPlainObject(null)).toEqual(false)
    })

    it('should return `false` for undefined', () => {
      expect(isPlainObject(undefined)).toEqual(false)
    })

    it('should return `true` for object with an undefined constructor', () => {
      expect(isPlainObject(Object.create(null))).toBeTruthy()
    })

    it('should return `false` if constructor does not have an Object-specific method', () => {
      class Foo {
        abc: any
        constructor() {
          this.abc = {}
        }
      }
      expect(isPlainObject(new Foo())).toBeFalsy()
    })

    it('should return `false` if the object has a modified prototype', () => {
      function Graph(this: any) {
        this.vertices = []
        this.edges = []
      }

      Graph.prototype.addVertex = function (v: any) {
        this.vertices.push(v)
      }

      expect(isPlainObject(Object.create(Graph))).toBeFalsy()
    })
  })

  describe('isPlainArray', () => {
    it('should return `true` for plain arrays', () => {
      expect(isPlainArray([1, 2])).toEqual(true)
    })

    it('should return `false` for non plain arrays', () => {
      expect(isPlainArray(Object.assign([1, 2], { a: 'b' }))).toEqual(false)
    })
  })

  describe('partialDeepEqual', () => {
    it('should return `true` if a includes b', () => {
      const a = { a: { b: 'b' }, c: 'c', d: [{ d: 'd ' }] }
      const b = { a: { b: 'b' }, c: 'c', d: [] }
      expect(partialDeepEqual(a, b)).toEqual(true)
    })

    it('should return `false` if a does not include b', () => {
      const a = { a: { b: 'b' }, c: 'c', d: [] }
      const b = { a: { b: 'b' }, c: 'c', d: [{ d: 'd ' }] }
      expect(partialDeepEqual(a, b)).toEqual(false)
    })

    it('should return `true` if array a includes array b', () => {
      const a = [1, 2, 3]
      const b = [1, 2]
      expect(partialDeepEqual(a, b)).toEqual(true)
    })

    it('should return `false` if a is null and b is not', () => {
      const a = null
      const b = { a: { b: 'b' }, c: 'c', d: [{ d: 'd ' }] }
      expect(partialDeepEqual(a, b)).toEqual(false)
    })

    it('should return `false` if a contains null and b is not', () => {
      const a = { a: null, c: 'c', d: [] }
      const b = { a: { b: 'b' }, c: 'c', d: [{ d: 'd ' }] }
      expect(partialDeepEqual(a, b)).toEqual(false)
    })

    it('should return `false` if b is null and a is not', () => {
      const a = { a: { b: 'b' }, c: 'c', d: [] }
      const b = null
      expect(partialDeepEqual(a, b)).toEqual(false)
    })

    it('should return `false` if b contains null and a is not', () => {
      const a = { a: { b: 'b' }, c: 'c', d: [] }
      const b = { a: null, c: 'c', d: [{ d: 'd ' }] }
      expect(partialDeepEqual(a, b)).toEqual(false)
    })
  })

  describe('replaceEqualDeep', () => {
    it('should return the previous value when the next value is an equal primitive', () => {
      expect(replaceEqualDeep(1, 1)).toBe(1)
      expect(replaceEqualDeep('1', '1')).toBe('1')
      expect(replaceEqualDeep(true, true)).toBe(true)
      expect(replaceEqualDeep(false, false)).toBe(false)
      expect(replaceEqualDeep(null, null)).toBe(null)
      expect(replaceEqualDeep(undefined, undefined)).toBe(undefined)
    })
    it('should return the next value when the previous value is a different value', () => {
      const date1 = new Date()
      const date2 = new Date()
      expect(replaceEqualDeep(1, 0)).toBe(0)
      expect(replaceEqualDeep(1, 2)).toBe(2)
      expect(replaceEqualDeep('1', '2')).toBe('2')
      expect(replaceEqualDeep(true, false)).toBe(false)
      expect(replaceEqualDeep(false, true)).toBe(true)
      expect(replaceEqualDeep(date1, date2)).toBe(date2)
    })

    it('should return the next value when the previous value is a different type', () => {
      const array = [1]
      const object = { a: 'a' }
      expect(replaceEqualDeep(0, undefined)).toBe(undefined)
      expect(replaceEqualDeep(undefined, 0)).toBe(0)
      expect(replaceEqualDeep(2, undefined)).toBe(undefined)
      expect(replaceEqualDeep(undefined, 2)).toBe(2)
      expect(replaceEqualDeep(undefined, null)).toBe(null)
      expect(replaceEqualDeep(null, undefined)).toBe(undefined)
      expect(replaceEqualDeep({}, undefined)).toBe(undefined)
      expect(replaceEqualDeep([], undefined)).toBe(undefined)
      expect(replaceEqualDeep(array, object)).toBe(object)
      expect(replaceEqualDeep(object, array)).toBe(array)
    })

    it('should return the previous value when the next value is an equal array', () => {
      const prev = [1, 2]
      const next = [1, 2]
      expect(replaceEqualDeep(prev, next)).toBe(prev)
    })

    it('should return a copy when the previous value is a different array subset', () => {
      const prev = [1, 2]
      const next = [1, 2, 3]
      const result = replaceEqualDeep(prev, next)
      expect(result).toEqual(next)
      expect(result).not.toBe(prev)
      expect(result).not.toBe(next)
    })

    it('should return a copy when the previous value is a different array superset', () => {
      const prev = [1, 2, 3]
      const next = [1, 2]
      const result = replaceEqualDeep(prev, next)
      expect(result).toEqual(next)
      expect(result).not.toBe(prev)
      expect(result).not.toBe(next)
    })

    it('should return the previous value when the next value is an equal empty array', () => {
      const prev: any[] = []
      const next: any[] = []
      expect(replaceEqualDeep(prev, next)).toBe(prev)
    })

    it('should return the previous value when the next value is an equal empty object', () => {
      const prev = {}
      const next = {}
      expect(replaceEqualDeep(prev, next)).toBe(prev)
    })

    it('should return the previous value when the next value is an equal object', () => {
      const prev = { a: 'a' }
      const next = { a: 'a' }
      expect(replaceEqualDeep(prev, next)).toBe(prev)
    })

    it('should replace different values in objects', () => {
      const prev = { a: { b: 'b' }, c: 'c' }
      const next = { a: { b: 'b' }, c: 'd' }
      const result = replaceEqualDeep(prev, next)
      expect(result).toEqual(next)
      expect(result).not.toBe(prev)
      expect(result).not.toBe(next)
      expect(result.a).toBe(prev.a)
      expect(result.c).toBe(next.c)
    })

    it('should replace different values in arrays', () => {
      const prev = [1, { a: 'a' }, { b: { b: 'b' } }, [1]] as const
      const next = [1, { a: 'a' }, { b: { b: 'c' } }, [1]] as const
      const result = replaceEqualDeep(prev, next)
      expect(result).toEqual(next)
      expect(result).not.toBe(prev)
      expect(result).not.toBe(next)
      expect(result[0]).toBe(prev[0])
      expect(result[1]).toBe(prev[1])
      expect(result[2]).not.toBe(next[2])
      expect(result[2].b.b).toBe(next[2].b.b)
      expect(result[3]).toBe(prev[3])
    })

    it('should replace different values in arrays when the next value is a subset', () => {
      const prev = [{ a: 'a' }, { b: 'b' }, { c: 'c' }]
      const next = [{ a: 'a' }, { b: 'b' }]
      const result = replaceEqualDeep(prev, next)
      expect(result).toEqual(next)
      expect(result).not.toBe(prev)
      expect(result).not.toBe(next)
      expect(result[0]).toBe(prev[0])
      expect(result[1]).toBe(prev[1])
      expect(result[2]).toBeUndefined()
    })

    it('should replace different values in arrays when the next value is a superset', () => {
      const prev = [{ a: 'a' }, { b: 'b' }]
      const next = [{ a: 'a' }, { b: 'b' }, { c: 'c' }]
      const result = replaceEqualDeep(prev, next)
      expect(result).toEqual(next)
      expect(result).not.toBe(prev)
      expect(result).not.toBe(next)
      expect(result[0]).toBe(prev[0])
      expect(result[1]).toBe(prev[1])
      expect(result[2]).toBe(next[2])
    })

    it('should copy objects which are not arrays or objects', () => {
      const prev = [{ a: 'a' }, { b: 'b' }, { c: 'c' }, 1]
      const next = [{ a: 'a' }, new Map(), { c: 'c' }, 2]
      const result = replaceEqualDeep(prev, next)
      expect(result).not.toBe(prev)
      expect(result).not.toBe(next)
      expect(result[0]).toBe(prev[0])
      expect(result[1]).toBe(next[1])
      expect(result[2]).toBe(prev[2])
      expect(result[3]).toBe(next[3])
    })

    it('should support equal objects which are not arrays or objects', () => {
      const map = new Map()
      const prev = [map, [1]]
      const next = [map, [1]]
      const result = replaceEqualDeep(prev, next)
      expect(result).toBe(prev)
    })

    it('should support non equal objects which are not arrays or objects', () => {
      const map1 = new Map()
      const map2 = new Map()
      const prev = [map1, [1]]
      const next = [map2, [1]]
      const result = replaceEqualDeep(prev, next)
      expect(result).not.toBe(prev)
      expect(result).not.toBe(next)
      expect(result[0]).toBe(next[0])
      expect(result[1]).toBe(prev[1])
    })

    it('should support objects which are not plain arrays', () => {
      const prev = Object.assign([1, 2], { a: { b: 'b' }, c: 'c' })
      const next = Object.assign([1, 2], { a: { b: 'b' }, c: 'c' })
      const result = replaceEqualDeep(prev, next)
      expect(result).toBe(next)
    })

    it('should replace all parent objects if some nested value changes', () => {
      const prev = {
        todo: { id: '1', meta: { createdAt: 0 }, state: { done: false } },
        otherTodo: { id: '2', meta: { createdAt: 0 }, state: { done: true } },
      }
      const next = {
        todo: { id: '1', meta: { createdAt: 0 }, state: { done: true } },
        otherTodo: { id: '2', meta: { createdAt: 0 }, state: { done: true } },
      }
      const result = replaceEqualDeep(prev, next)
      expect(result).toEqual(next)
      expect(result).not.toBe(prev)
      expect(result).not.toBe(next)
      expect(result.todo).not.toBe(prev.todo)
      expect(result.todo).not.toBe(next.todo)
      expect(result.todo.id).toBe(next.todo.id)
      expect(result.todo.meta).toBe(prev.todo.meta)
      expect(result.todo.state).not.toBe(next.todo.state)
      expect(result.todo.state.done).toBe(next.todo.state.done)
      expect(result.otherTodo).toBe(prev.otherTodo)
    })

    it('should replace all parent arrays if some nested value changes', () => {
      const prev = {
        todos: [
          { id: '1', meta: { createdAt: 0 }, state: { done: false } },
          { id: '2', meta: { createdAt: 0 }, state: { done: true } },
        ],
      }
      const next = {
        todos: [
          { id: '1', meta: { createdAt: 0 }, state: { done: true } },
          { id: '2', meta: { createdAt: 0 }, state: { done: true } },
        ],
      }
      const result = replaceEqualDeep(prev, next)
      expect(result).toEqual(next)
      expect(result).not.toBe(prev)
      expect(result).not.toBe(next)
      expect(result.todos).not.toBe(prev.todos)
      expect(result.todos).not.toBe(next.todos)
      expect(result.todos[0]).not.toBe(prev.todos[0])
      expect(result.todos[0]).not.toBe(next.todos[0])
      expect(result.todos[0]?.id).toBe(next.todos[0]?.id)
      expect(result.todos[0]?.meta).toBe(prev.todos[0]?.meta)
      expect(result.todos[0]?.state).not.toBe(next.todos[0]?.state)
      expect(result.todos[0]?.state.done).toBe(next.todos[0]?.state.done)
      expect(result.todos[1]).toBe(prev.todos[1])
    })
  })

  describe('parseMutationArgs', () => {
    it('should return mutation options', () => {
      const options = { mutationKey: ['key'] }
      expect(parseMutationArgs(options)).toMatchObject(options)
    })
  })

  describe('matchMutation', () => {
    it('should return false if mutationKey options is undefined', () => {
      const filters = { mutationKey: ['key1'] }
      const queryClient = createQueryClient()
      const mutation = new Mutation({
        mutationId: 1,
        mutationCache: queryClient.getMutationCache(),
        options: {},
      })
      expect(matchMutation(filters, mutation)).toBeFalsy()
    })
  })

  describe('scheduleMicrotask', () => {
    it('should defer execution of callback', async () => {
      const callback = jest.fn()

      scheduleMicrotask(callback)
      expect(callback).not.toHaveBeenCalled()
      await sleep(0)
      expect(callback).toHaveBeenCalledTimes(1)
    })
  })
})